selftests: mlxsw: Reduce router scale running time using offload indication

Currently, the test inserts X /32 routes and for each route it is
testing that a packet sent from the first host is received by the second
host, which is very time-consuming.

Instead only validate the offload flag of each route and get the same result.

Wait between the creation of the routes and the offload validation in
order to make sure that all the routes were successfully offloaded.
Signed-off-by: Danielle Ratson <danieller@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/drivers/net/mlxsw/router_scale.sh

@@ -2,16 +2,15 @@
 # SPDX-License-Identifier: GPL-2.0
 
 ROUTER_NUM_NETIFS=4
+: ${TIMEOUT:=20000} # ms
 
 router_h1_create()
 {
 	simple_if_init $h1 192.0.1.1/24
-	ip route add 193.0.0.0/8 via 192.0.1.2 dev $h1
 }
 
 router_h1_destroy()
 {
-	ip route del 193.0.0.0/8 via 192.0.1.2 dev $h1
 	simple_if_fini $h1 192.0.1.1/24
 }
 
@@ -64,13 +63,15 @@ router_setup_prepare()
 	router_create
 }
 
-router_offload_validate()
+wait_for_routes()
 {
-	local route_count=$1
-	local offloaded_count
+	local t0=$1; shift
+	local route_count=$1; shift
 
-	offloaded_count=$(ip route | grep -o 'offload' | wc -l)
-	[[ $offloaded_count -ge $route_count ]]
+	local t1=$(ip route | grep -o 'offload' | wc -l)
+	local delta=$((t1 - t0))
+	echo $delta
+	[[ $delta -ge $route_count ]]
 }
 
 router_routes_create()
@@ -90,8 +91,8 @@ router_routes_create()
 					break 3
 				fi
 
-				echo route add 193.${i}.${j}.${k}/32 via \
-				       192.0.2.1 dev $rp2  >> $ROUTE_FILE
+				echo route add 193.${i}.${j}.${k}/32 dev $rp2 \
+					>> $ROUTE_FILE
 				((count++))
 			done
 		done
@@ -111,45 +112,19 @@ router_test()
 {
 	local route_count=$1
 	local should_fail=$2
-	local count=0
+	local delta
 
 	RET=0
 
+	local t0=$(ip route | grep -o 'offload' | wc -l)
 	router_routes_create $route_count
+	delta=$(busywait "$TIMEOUT" wait_for_routes $t0 $route_count)
 
-	router_offload_validate $route_count
-	check_err_fail $should_fail $? "Offload of $route_count routes"
+	check_err_fail $should_fail $? "Offload routes: Expected $route_count, got $delta."
 	if [[ $RET -ne 0 ]] || [[ $should_fail -eq 1 ]]; then
 		return
 	fi
 
-	tc filter add dev $h2 ingress protocol ip pref 1 flower \
-		skip_sw dst_ip 193.0.0.0/8 action drop
-
-	for i in {0..255}
-	do
-		for j in {0..255}
-		do
-			for k in {0..255}
-			do
-				if [[ $count -eq $route_count ]]; then
-					break 3
-				fi
-
-				$MZ $h1 -c 1 -p 64 -a $h1mac -b $rp1mac \
-					-A 192.0.1.1 -B 193.${i}.${j}.${k} \
-					-t ip -q
-				((count++))
-			done
-		done
-	done
-
-	tc_check_packets "dev $h2 ingress" 1 $route_count
-	check_err $? "Offload mismatch"
-
-	tc filter del dev $h2 ingress protocol ip pref 1 flower \
-		skip_sw dst_ip 193.0.0.0/8 action drop
-
 	router_routes_destroy
 }